S = input()
if S.count("k") == 2 and S.count("o") == 2 and S.count("p") == 1 and S.count("y") == 1 and S.count("r") == 1 and S.count("t") == 1 and S.count("e") == 2 and S.count("i") == 1 and S.count("n") == 1 and S.count("9") == 1 and S.count("0") == 1:
    print("Yes")
else:
    print("No")